19mm 2" 82° Luminos

by Celestron Print

What would you like to print?
(Reviews and Documents/Videos will not be printed)

Basic Product Information
Full Description
Tech Details
Supplied Accessories
Recommended Accessories
Images

Print
More product information
This exceptional Celestron 19mm Luminos ultra wide field 2” eyepiece uses six optical elements for optimized performance across a very wide and flat 82° field of view. A 10” f/4.5 Dobsonian reflector will have a full 1.36° field at 60x with this eyepiece, large enough to hold all of the Pleiades in a single field. A 4” f/8 refractor will have a 1.91° field at 43x, nearly four times the diameter of the full Moon. The calculator below will show you how wide a field you can expect with your particular telescope.

This 19mm Celestron Luminos is designed to have minimal field curvature. This makes it particularly well-suited for use with flat field telescopes such as Celestron EdgeHD and Meade Advanced Coma-Free flat field catadioptric scopes and refractors with field flatteners.

Field of view:
The field of view (FOV) is the amount of observable world one can see at any given moment.
82°
Eye Relief:
Eye relief is the distance from the last surface of the eye lens of an eyepiece to the plane behind the eyepiece where all the light rays of the exit pupil come to a focus and the circular image is formed, sometimes called the “Ramsden Disk.” This is where your eye should be positioned to see the full field of view of the eyepiece. If you must wear glasses because of astigmatism, you’ll usually need at least 15mm of eye relief or longer if you want to see the full field of view with your glasses on.

A note on our eye relief figures: Quite often, our eye relief figures will differ from those of the manufacturer. This is because we measure the “usable” eye relief, while the manufacturers specify their usually-longer (but technically correct) “designed” eye relief.

The eye lens of the eyepiece is normally recessed below the rubber eyeguard or rubber rim of the eyepiece to keep the lens from being scratched during use. An eyepiece might have a “designed” eye relief of 15mm (and the eye relief will truly measure 15mm from the eye lens to where the image forms). However, if the eye lens is recessed 3mm below the eye guard, the Ramsden Disk forms only 12mm above the eyepiece body (the 15mm “designed” eye relief, less the 3mm of eye relief made unusable by having the eye lens recessed into the body of the eyepiece). This “usable” eye relief of 12mm (measured from the rolled-down eyeguard – the closest point you can get your eye to the eye lens – to where the image forms) is the eye relief figure we would measure and list in this website.

Why is it important to list the “usable” eye relief? For those people who don’t wear eyeglasses while observing, a few mm difference between the eye relief they expect from the manufacturer’s literature and the shorter eye relief they actually get in real life doesn’t mean a lot. They can simply move a little closer to the eyepiece to see the full field, and never realize that the eye relief is a little shorter than they expected. However, some people must wear eyeglasses while observing, because of severe astigmatism. These observers can’t move closer to the eyepiece if the eye relief is shorter than expected because their glasses get in the way. For these people, the real life “usable” eye relief is more important than the technically correct but sometimes not fully usable “designed” eye relief. We measure and list the actual usable eye relief so that people in the real world can pick the eyepieces that will work best for them.

20mm
Focal Length:
This is the length of the effective optical path of a telescopeor eyepiece (the distance from the main mirror or lens where the lightis gathered to the point where the prime focus image is formed). Focallength is typically expressed in millimeters.

The longer the focallength, the higher the magnification and the narrower the field of viewwith any given eyepiece. The shorter the focal length, the lower themagnification and the wider the field of view with the same eyepiece.

19mm
Number of optical elements:
6
Barrel Size:
The industry standard diameter, as of 2011, is 1.25" and is the most common.  Other sizes available are .965" and 2".
2"
Weight:
The weight of this product.
16.2 oz
Warranty:
2 years
There are currently no Cloudy Nights reviews associated with this product

User Ratings/Reviews from our Customers (www.astronomics.com)
Overall Product Rating: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics(3.00)   # of Ratings: 2   (Only registered customers can rate)

(Only registered customers can rate)

5 - Great (0.00%) (0 users)
4 - Good (50.00%) (1 user)
3 - OK (0.00%) (0 users)
2 - Bad (50.00%) (1 user)
1 - Very Bad (0.00%) (0 users)
0% 50% 100%
astronomics image
astronomics image

Sort Ratings: 

  Show these ratings: ALLGreatGoodOKBadVery Bad

loading request
Showing comments 1-2 of 2
1. David on 3/6/2013, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
Really this was a very frustrating eyepiece because it has potential to be outstanding, but ultimately I found the execution and quality control lacking. First the good. The 19mm Luminos has outstanding coatings as deep sky objects had very bright rendition. The eye relief is very comfortable and easily accomodates use with eyeglasses. The edge performance is ok. However, the eyepiece suffers from significant edge of field brightening. The outer field sky background is lighter than in the central field and ultimately this bleeds contrast from the view. In addition my sample was bought new and came with internal dust. When I took it apart I also found a fingerprint on the internal lense surfaces. Basically Celestron has here an eyepiece that could be outstanding but is poorly executed.
Was this comment helpful? Yes No   (3 people found this comment helpful, 0 did not)
2. Jim on 9/27/2012, said: AstronomicsAstronomicsAstronomicsAstronomicsAstronomics
Between the 23mm, 19mm, 15mm and 10mm this is the pick of the litter with nice views if you can put up with a slight halo of light around the outside 10% of the FOV. The family of Luminos EPs appears to have a design or manufacturing flaw. The previous Axiom LX line shows no scatter problems. Something changed when Celestron switched to a different supplier.
Was this comment helpful? Yes No   (3 people found this comment helpful, 0 did not)
Showing comments 1-2 of 2
We haven't recommended any accessories for this product quite yet... check back soon or call one of our experts (1-405-364-0858).
This product does not have supplied accessories... or supplied accessories have not been assigned.
Documents
No documents have been associated with this product.
Videos
No videos have been associated with this product.
Helpful Formulas
Telescope Eyepiece Formula
To calculate the magnification and approximate actual field of view of this eyepiece on your telescope, enter the focal length of your telescope below and press the "Calculate" button.

Enter your telescope's focal length: mm   



Celestron - 19mm 2" 82° Luminos

Click icon(s) below & hover image above for zoom

Celestron - 19mm 2" 82° LuminosImage showing how the twist-up eyecup extends from the body of a typical Celestron Luminos eyepiece when the rubber grip band is turned.
 AstronomicsAstronomicsAstronomicsAstronomicsAstronomics (Average: 3.00 | Users: 2)  Only registered users can submit ratings - Register Here
Our Product #: CL8219
Manufacturer Product #: 93433
Price: $207.95  FREE ground shipping - Click for more info
Congratulations. Your order qualifies for free ground shipping within the 48 contiguous United States.
MSRP: $331.95
Quantity:   

 E-mail this product to a friend E-mail this product to a friend

Your Email:  
Your Friend's Email:  
Confirm Friend's Email:  

Comments:
  200 characters or less
 

An email containing a link to this product has been sent to the email address you provided.

Clear Skies!
Astronomics

 Have a question? Do you have a question about this product?
 Found a better price? Found a lower price? Click to let us know... or call 800-422-7876 before you buy.

If you’ve found a lower delivered price on this product, let us know about it below. We’ll do our best to meet or beat that price and will get back to you within one business day with our best offer. Thanks for giving us the opportunity to give you a better deal.

Your Name:  
Price:  
From Who:  
Context:  Magazine AdOnline
Website Address:  
Cut and paste the web address into the box above
Your Email:  
Confirm Email:  


We’ll do our best to meet or beat that price and will get back to you within one business day with our best offer. Thanks for giving us the opportunity to give you a better deal.

Clear skies,
Astronomics


This 19mm Celestron Luminos eyepiece has a wide and flat 82° field of view for medium power "picture window" views and is superb for Celestron EdgeHD and Meade Advanced Coma-Free catadioptrics, 2" focuser Dobsonians, and short focal length flat field refractors . . .





. . . our 34th year